Classifications

• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C215/00—Compounds containing amino and hydroxy groups bound to the same carbon skeleton
  • C07C215/46—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups bound to carbon atoms of at least one six-membered aromatic ring and amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings of the same carbon skeleton
  • C07C215/64—Compounds containing amino and hydroxy groups bound to the same carbon skeleton having hydroxy groups bound to carbon atoms of at least one six-membered aromatic ring and amino groups bound to acyclic carbon atoms or to carbon atoms of rings other than six-membered aromatic rings of the same carbon skeleton with rings other than six-membered aromatic rings being part of the carbon skeleton
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C225/00—Compounds containing amino groups and doubly—bound oxygen atoms bound to the same carbon skeleton, at least one of the doubly—bound oxygen atoms not being part of a —CHO group, e.g. amino ketones
  • C07C225/20—Compounds containing amino groups and doubly—bound oxygen atoms bound to the same carbon skeleton, at least one of the doubly—bound oxygen atoms not being part of a —CHO group, e.g. amino ketones having amino groups bound to carbon atoms of rings other than six-membered aromatic rings of the carbon skeleton
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P15/00—Drugs for genital or sexual disorders; Contraceptives
  • A61P15/08—Drugs for genital or sexual disorders; Contraceptives for gonadal disorders or for enhancing fertility, e.g. inducers of ovulation or of spermatogenesis
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P15/00—Drugs for genital or sexual disorders; Contraceptives
  • A61P15/10—Drugs for genital or sexual disorders; Contraceptives for impotence
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/28—Drugs for disorders of the nervous system for treating neurodegenerative disorders of the central nervous system, e.g. nootropic agents, cognition enhancers, drugs for treating Alzheimer's disease or other forms of dementia
• • A—HUMAN NECESSITIES
  • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
  • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
  • A61P25/00—Drugs for disorders of the nervous system
  • A61P25/30—Drugs for disorders of the nervous system for treating abuse or dependence
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2601/00—Systems containing only non-condensed rings
  • C07C2601/12—Systems containing only non-condensed rings with a six-membered ring
  • C07C2601/14—The ring being saturated
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C2602/00—Systems containing two condensed rings
  • C07C2602/02—Systems containing two condensed rings the rings having only two atoms in common
  • C07C2602/04—One of the condensed rings being a six-membered aromatic ring
  • C07C2602/10—One of the condensed rings being a six-membered aromatic ring the other ring being six-membered, e.g. tetraline

Definitions

• 5-HT receptors There are multiple types of 5-HT receptors. These receptors have been classified as 5-HT 1 , 5-HT 2 , and 5-HT 3 receptors, with the former being further divided into the sub-classes 5-HT 1A , 5-HT 1B , 5-HT 1C , and 5-HT 1D .
• 2-aminotetralins are described in European Patent Application No. 343,830, published Nov. 29, 1989. These compounds have a piperazinyl or homopiperazinyl moiety in the 2-position and, distinct from the foregoing tetralins, do not exhibit affinity for serotonin receptors but rather inhibit the re-uptake of serotonin.
• 5-HT 1A agonist activity a further class of compounds which, by reason of their 5-HT 1A agonist activity, are useful in the treatment, for example, of sexual dysfunction, anxiety, depression, obsessive-compulsive behavior, cognition disorders, emesis, drug abuse, hypertension, excess acid secretion, and eating disorders, such as anorexia.
• the present invention provides novel ring-substituted 2-amino-1,2,3,4-tetrahydronaphthalenes and 3-aminochromanes which are selective agonists at the 5-HT 1A receptor.
• this invention is directed to a compound of the formula ##STR1## in which R is C 1 -C 4 alkyl, C 3 -C 4 alkenyl, or cyclopropylmethyl;
• R 3 is hydrogen
• R and R 3 taken together are a divalent group of the formula --CH 2 CH 2 CH 2 --;
• R 1 is hydrogen, C 1 -C 4 alkyl, C 3 -C 4 alkenyl, cyclopropylmethyl, aryl(C 1 -C 4 -alkyl), --COR 4 , --(CH 2 ) n S(C 1 -C 4 alkyl) or --(CH 2 ) n CONR 5 R 6 ;
• n is an integer from 1 to 4.
• R 4 is hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, or phenyl;
• R 5 and R 6 are independently hydrogen, a C 1 -C 4 alkyl, or C 3 -C 7 cycloalkyl with the proviso that when one of R 5 or R 6 is cycloalkyl the other is hydrogen;
• X is --CH 2 --, --O--, --S--, ##STR2##
• A is ##STR3##
• R 2 is C 1 -C 8 alkyl, substituted C 1 -C 8 alkyl, C 2 -C 4 alkenyl, aryl, substituted aryl, aryl(C 1 -C 4 -alkyl), substituted aryl(C 1 -C 4 alkyl), C 3 -C 7 cycloalkyl-substituted methyl, or C 3 -C 7 cycloalkyl;
• This invention also provides a pharmaceutical formulation which comprises, in association with a pharmaceutically acceptable carrier, diluent, or excipient, a compound of the formula ##STR4## in which R is C 1 -C 4 alkyl, C 3 -C 4 alkenyl or cyclopropylmethyl;
• R 3 is hydrogen
• R and R 3 taken together are a divalent group of the formula --CH 2 CH 2 CH 2 --;
• R 1 is hydrogen, C 1 -C 4 alkyl, C 3 -C 4 alkenyl, cyclopropylmethyl, aryl(C 1 -C 4 -alkyl), --COR 4 , --(CH 2 ) n S(C 1 -C 4 alkyl) or --(CH 2 ) n CONR 5 R 6 ;
• n is an integer from 1 to 4.
• R 4 is hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, or phenyl;
• R 5 and R 6 are independently hydrogen, C 1 -C 4 alkyl, or C 3 -C 7 cycloalkyl with the proviso that when one of R 5 or R 6 is cycloalkyl the other is hydrogen;
• R 2 is C 1 -C 8 alkyl, substituted C 1 -C 8 alkyl, alkenyl, aryl, substituted aryl, aryl(C 1 -C 4 -alkyl), substituted aryl(C 1 -C 4 alkyl), C 3 -C 7 cycloalkyl-substituted methyl, or C 3 -C 7 cycloalkyl;
• a further embodiment of the invention is a method for effecting a biological response at the 5-HT 1A receptor. More particularly, further embodiments are methods for treating a variety of disorders in mammals which may be treated by stimulating 5-HT 1A receptors. Included among these disorders are anxiety, depression, sexual dysfunction, obsessive-compulsive behavior, hypertension, excess acid secretion, and eating disorders. Any of these methods employ a compound of the formula ##STR6## in which R is C 1 -C 4 alkyl, C 3 -C 4 alkenyl or cyclopropylmethyl;
• R 3 is hydrogen
• R and R 3 taken together are a divalent group of the formula --CH 2 CH 2 CH 2 --;
• R 1 is hydrogen, C 1 -C 4 alkyl, C 3 -C 4 alkenyl, cyclopropylmethyl, aryl(C 1 -C 4 -alkyl), --COR 4 , --(CH 2 ) n S(C 1 -C 4 alkyl) or --(CH 2 ) n CONR 5 R 6 ;
• n is an integer from 1 to 4.
• R 4 is hydrogen, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, or phenyl;
• R 5 and R 6 are independently hydrogen, C 1 -C 4 alkyl, or C 3 -C 7 cycloalkyl with the proviso that when one of R 5 or R 6 is cycloalkyl the other is hydrogen; ##STR7##
• R 2 is C 1 -C 8 alkyl, substituted C 1 -C 8 alkyl, C 2 -C 4 alkenyl, aryl, substituted aryl, aryl(C 1 -C 4 -alkyl), substituted aryl(C 1 -C 4 alkyl), C 3 -C 7 cycloalkyl-substituted methyl, or C 3 -C 7 cycloalkyl;
• C 1 -C 4 alkyl means a straight or branched alkyl chain having from one to four carbon atoms.
• Such C 1 -C 4 alkyl groups are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, and t-butyl.
• C 1 -C 8 alkyl means a straight or branched alkyl chain having from one to eight carbon atoms. Groups which are included in such term are methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-pentyl, 2-methylbutyl, 3-methylbutyl, n-hexyl, 4-methylpentyl, n-heptyl, 3-ethylpentyl, 2-methylhexyl, 2,3-dimethylpentyl, n-octyl, 3-propylpentyl, 6-methylheptyl, and the like.
• C 1 -C 4 alkoxy means any of methoxy, ethoxy, n-propoxy, isopropoxy, n-butoxy, isobutoxy, t-butoxy, and sec-butoxy.
• aryl means an aromatic carbocyclic structure. Examples of such ring structures are phenyl, naphthyl, and the like.
• C 3 -C 7 cycloalkyl means cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl.
• aryl (C 1 -C 4 alkyl) means an aromatic carbocyclic structure joined to a C 1 -C 4 alkyl group. Examples of such groups are benzyl, phenylethyl, ⁇ -methylbenzyl, 3-phenylpropyl, ⁇ -naphthylmethyl, ⁇ -naphthylmethyl, 4-phenylbutyl, and the like.
• C 2 -C 4 alkenyl means a straight or branched hydrocarbon chain having from two to four carbon atoms and containing one double bond.
• Groups which are included in such terms are vinyl, 1-methylvinyl, 2-methylvinyl, allyl, 2-butenyl, 3-butenyl, 1-butenyl, 1-methylallyl, 2-methylallyl, and the like.
• C 3 --C 4 alkenyl is specifically defined to mean any of allyl, 2-butenyl, 3-butenyl, and 2-methylallyl.
• C 1 -C 8 alkyl, the aryl, and the aryl (C 1 -C 4 alkyl) groups may be substituted by one or two moieties.
• Typical aryl and/or alkyl substituents are C 1 -C 3 alkoxy, halo, hydroxy, C 1 -C 3 thioalkyl, and the like.
• the aryl and aryl (C 1 -C 4 alkyl) groups may also be substituted by a C 1 -C 3 alkyl or a trifluoromethyl group.
• C 1 -C 3 alkyl means any of methyl, ethyl, n-propyl, and isopropyl;
• C 1 -C 3 alkoxy means any of methoxy, ethoxy, n-propoxy, and isopropoxy;
• halo means any of fluoro, chloro, bromo, and iodo;
• C 1 -C 3 thioalkyl means any of methylthio, ethylthio, n-propylthio, and isopropylthio.
• substituted C 1 -C 8 alkyl examples include methoxymethyl, trifluoromethyl, 6-chlorohexyl, 2-bromopropyl, 2-ethoxy-4-iodobutyl, 3-hydroxypentyl, methylthiomethyl, and the like.
• substituted aryl examples include p-bromophenyl, m-iodophenyl, p-tolyl, o-hydroxyphenyl, ⁇ -(4-hydroxy)naphthyl, p-(methylthio)phenyl, m-trifluoromethylphenyl, 2-chloro-4-methoxyphenyl, ⁇ -(5-chloro)-naphthyl, and the like.
• substituted aryl C 1 -C 4 alkyl
• substituted aryl C 1 -C 4 alkyl
• p-chlorobenzyl o-methoxybenzyl
• m-(methylthio)- ⁇ -methylbenzyl 3-(4'-trifluoromethylphenyl)-propyl
• o-iodobenzyl p-methylbenzyl, and the like.
• R and R 1 preferably are both C 1 -C 4 alkyl, and, more preferably, both are n-propyl.
• X preferably is --CH 2 --.
• R 2 preferably is C 1 -C 8 alkyl, and, more preferably, C 1 -C 5 alkyl. Most preferably, R 2 is t-butyl.
• the compounds of the present invention possess an asymmetric carbon represented by the carbon atom labeled with an asterisk in the following formula: ##STR10##
• each of the compounds exists as its individual d- and 1-stereoisomers and also as the racemic mixture of such isomers.
• the compounds of the present invention include not only the dl-racemates but also their respective optically active d- and 1-isomers.
• the invention includes pharmaceutically acceptable acid addition salts of the compounds defined by the above formula in which A is ##STR11##
• the compounds of this invention are amines, they are basic in nature and accordingly react with any of a number of inorganic and organic acids to form pharmaceutically acceptable acid addition salts. Since the free amines of the compounds of this invention are typically oils at room temperature, it is preferable to convert the free amines to their corresponding pharmaceutically acceptable acid addition salts for ease of handling and administration, since the latter are routinely solid at room temperature.
• Acids commonly employed to form such salts are inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, phosphoric acid, and the like, and organic acids such as maleic, fumaric, p-toluenesulfonic, methanesulfonic acid, oxalic acid, p-bromophenylsulfonic acid, carbonic acid, succinic acid, citric acid, benzoic acid, acetic acid, and the like.
• inorganic acids such as hydrochloric acid, hydrobromic acid, hydroiodic acid, sulfuric acid, phosphoric acid, and the like
• organic acids such as maleic, fumaric, p-toluenesulfonic, methanesulfonic acid, oxalic acid, p-bromophenylsulfonic acid, carbonic acid, succinic acid, citric acid, benzoic acid, acetic acid, and the like.
• Examples of such pharmaceutically acceptable salts thus are the sulfate, pyrosulfate, bisulfate, sulfite, bisulfite, phosphate, monohydrogenphosphate, dihydrogenphosphate, metaphosphate, pyrophosphate, chloride, bromide, iodide, acetate, propionate, decanoate, caprylate, acrylate, formate, isobutyrate, caproate, heptanoate, propiolate, oxalate, malonate, succinate, suberate, sebacate, fumarate, maleate, butyne-1,4-dioate, hexyne-1,6-dioate, benzoate, chlorobenzoate, methylbenzoate, dinitrobenzoate, hydroxybenzoate, methoxybenzoate, phthalate, sulfonate, xylenesulfonate, phenylacetate, phenylpropionate, phen
• solvates may form solvates with water or organic solvents such as ethanol. Such solvates also are included as compounds of this invention.
• the compounds of the present invention may be prepared by procedures well known to those of ordinary skill in the art.
• the compounds in which X is --CH 2 -- and R 3 is hydrogen preferably are synthesized by preparation of an 8-bromo-2-tetralone.
• the 8-bromo-2-tetralone then is reductively aminated with the desired amine to produce the desired 2-amino-8-bromotetralin intermediate.
• the 8-bromo intermediate then is treated to produce the desired product directly or via the corresponding compound in which the group in the 8-position is R 2 CH(OH)--.
• the 8-bromo-2-tetralones represent intermediates which, when reductively aminated and treated, via lithiation, with the appropriate reagent, result in compounds of this invention.
• the reaction involves the use of an aldehyde
• the product which results, although having activity in its own right is, in general, an intermediate of formula I (A is ⁇ CHOH) to the preparation of the final product.
• the reaction involves the use of an ester, the product is the final product itself (A is ⁇ C ⁇ O).
• tetralones are available by any of a wide range of recognized methods. For example, they can be produced by a Friedel-Crafts reaction of an appropriately ring-substituted phenylacetyl chloride with ethylene in the presence of aluminum chloride.
• the tetralone once formed, can, by simple reductive amination using the selected amine, be converted to a 2-amino-8-bromo-1,2,3,4-tetrahydronaphthalene useful as an intermediate to a compound of this invention.
• the tetralone is first reacted with the amine to form the corresponding enamine after which the enamine is reduced with sodium borohydride to the tetrahydronaphthalene.
• the 2-amino-8-bromo-1,2,3,4-tetrahydronaphthalene can be used to produce compounds of this invention by formation of a lithium intermediate via a lithiation reaction using an alkyllithium, preferably n-butyllithium.
• the reactive lithium intermediate then is treated with an appropriate carbonyl compound to produce either the ketone directly or a precursor of the ketone.
• treatment of the 8-lithio tetralin with a compound R 2 COZ, where Z is halo, alkoxy, hydroxy, aryloxy, --S--(C 1 -C 3 alkyl), --OCO 2 R', ##STR13## and the like, will, upon workup, yield the desired ketone.
• a further alternative synthesis entails reacting the 8-lithiotetralin with an appropriate aldehyde to yield an alcohol of formula I (A ⁇ CHOH) which is subsequently oxidized to the ketone.
• the aforementioned alcohol can also be prepared by addition of a suitable organometallic reagent (R 2 M in which M is Li, MgW, ZnW, and the like, W being an appropriate halide) to an 8-formyl-2-aminotetralin.
• R 2 M suitable organometallic reagent
• the 8-formyl-2-aminotetralin is prepared by addition of the 8-lithio-2-aminotetralin to dimethylformamide with aqueous workup of the resulting product.
• the 8-bromo-2-tetralone can first be protected and the bromo substituent converted to the appropriate ketone as described above.
• the resulting 8-acyl-2-tetralone, after deprotection, can then be reductively aminated to a compound of this invention.
• the 8-lithio tetralin may be replaced by the corresponding Grignard reagent to yield the desired product.
• the compounds of this invention in which X is oxygen are available by reductive amination and bromo replacement as in the foregoing, but using 5-bromo-3-chromanone.
• the latter can be produced by a sequence of reactions beginning with m-bromophenol. Briefly, m-bromophenol is treated with allyl bromide in the presence of potassium carbonate to produce allyl 3-bromophenyl ether. The ether is converted to 2 -allyl-3-bromophenol upon heating it in the presence of N,N-dimethylaniline. The phenol, upon reaction with ethyl chloroacetate, is converted to the ethyl ester of 2-allyl-3-(carboxymethoxy)bromobenzene.
• the allyl group Upon oxidation using ozone followed by reductive work up, the allyl group is converted to a formylmethyl substituent which is then further oxidized using Jones' Reagent to the carboxymethyl substituent, the resulting product being the ethyl ester of (2-carboxymethyl-3-bromo)phenoxyacetic acid.
• the partial ester is converted to the diethyl ester using ethanol and gaseous hydrogen chloride.
• the diester In the presence of potassium t-butoxide, the diester is cyclized to a mixture of 4-ethoxycarbonyl-5-bromo-3-chromanone and 2-ethoxycarbonyl-5-bromo-3-chromanone. Upon heating in the presence of acid, the latter is converted to 5-bromo-3-chromanone.
• An alternate and improved synthesis of the 5-bromo-3-chromanone involves a sequence of reactions beginning with the ethyl ester of (2-allyl-3-carboxymethoxy)bromobenzene.
• the bromobenzene is oxidized using ozone to form, upon work-up with dimethyl thioether, the ethyl ester of (2-formylmethyl-3-carboxymethoxy)bromobenzene.
• the formylmethyl substituent is further oxidized to carboxymethyl using Jones' Reagent, the resulting product being (2-bromo-6-ethoxycarbonylmethoxy)phenylacetic acid.
• the acid is esterified to the t-butyl ester using t-butyl acetate and sulfuric acid, after which the resulting diester is cyclized in the presence of potassium t-butoxide to 4-t-butoxycarbonyl-5-bromo-3-chromanone.
• the t-butoxycarbonyl group then is cleaved using trifluoroacetic acid with formation of the desired 5-bromo-3-chromanone.
• the compounds of this invention in which X is sulfur are available by bromo replacement of the corresponding 2-amino-5-bromothiochromanes.
• the latter are available by a sequence of reactions beginning with m-bromothiophenol.
• the thiophenol is treated in base with ⁇ -chloropropionic acid to produce m-bromophenylthiopropionic acid.
• the acid then is cyclized with polyphosphoric acid or with thionyl chloride or phosgene and a Lewis acid to produce a mixture of 5-bromo-4-thiochromanone and 7-bromo-4-thiochromanone.
• the thiochromanone mixture is reduced using, for example, sodium borohydride, to produce 4-bromo-1,2-benzothiapyran which is then oxidized with an organic peroxide to the corresponding sulfoxide having an epoxy group in the 3,4 position.
• 5-bromo-3-thiochromanone sulfoxide is formed which can be reduced to the corresponding thiochromanone using dimethyl sulfide in the presence of trifluroacetic anhydride, oxalyl chloride, thionyl chloride, and the like, or reductively aminated to the 3-amino-5-bromothiochromane sulfoxide by treatment with the appropriate amine and sodium borohydride. The latter is reduced to the desired 3-amino-5-bromothiochromane using trifluoroacetic anhydride.
• reaction proceeds via a trialkylstannyl intermediate of the formula ##STR14## in which R 7 is C 1 -C 4 alkyl.
• the stannyl intermediate then is reacted with an acyl chloride in the presence of a suitable catalyst such as dichlorobis(triphenylphosphine)palladium II or palladium dichloride.
• a suitable catalyst such as dichlorobis(triphenylphosphine)palladium II or palladium dichloride.
• the second additional sequence proceeds via an alkyne intermediate of the formula ##STR15## in which X, R, R 1 , and R 3 are as above and R 8 is hydrogen, C 1 -C 7 alkyl, C 1 -C 7 substituted alkyl, aryl, substituted aryl, aryl(C 1 -C 3 alkyl), or substituted aryl (C 1 -C 3 alkyl).
• R 2 is C 1 -C 8 alkyl, C 1 -C 8 substituted alkyl, aryl-(C 1 -C 4 alkyl), or substituted aryl(C 1 -C 4 alkyl).
• the foregoing compounds of formula IV are prepared by reacting an iodo compound of the formula ##STR16## with a 1-alkyne in a suitable inert solvent and in the presence of a palladium catalyst such as tetrakis (triphenylphosphine)palladium or palladium dichloride.
• a palladium catalyst such as tetrakis (triphenylphosphine)palladium or palladium dichloride.
• Suitable catalysts are, for example, protic acids such as HCl, HBr and H 2 SO 4 as well as mercury (II) salts.
• the compounds of this invention also include those in which the groups R and R 3 taken together represent a --CH 2 CH 2 CH 2 -- group. These compounds can be prepared from the corresponding bromo-substituted tetralones, chromanones, or thiochromanones.
• the foregoing bromo-substituted compound is reacted with pyrrolidine to form the corresponding 3-pyrrolidino-1,2-dihydronaphthalene, 3-pyrrolidinobenzpyran, or 3-pyrrolidinobenzthiopyran.
• the 3-pyrrolidino compound then is reacted with acrylamide to produce the corresponding cyclic amide bridging the 3,4-position and comprising the group --NH--CO--CH 2 --CH 2 --.
• the resulting product then is sequentially reduced, first using HSiEt 3 and trifluoroacetic acid to reduce the 3,4 double bond and then using B 2 H 6 or BH 3 .SMe 2 to reduce the cyclic amide carbonyl.
• the resulting product is a highly useful intermediate to the compounds of this invention.
• the intermediate is one in which X is --CH 2 --, --S--, or --O--, R 1 is hydrogen, and R and R 3 taken together represent a group of the formula --CH 2 CH 2 CH 2 --.
• the intermediate contains a bromo substituent at the 8-position of the tetralin (X ⁇ --CH 2 --) or the 5-position of the chromane (X ⁇ O) or thiochromane (X ⁇ S).
• the foregoing intermediates can be further modified by conversion of the group R 1 from hydrogen to C 1 -C 4 alkyl, allyl, cyclopropylmethyl, or aryl(C 1 -C 4 alkyl) by reaction with the appropriate organic bromide or iodide.
• both are available from the corresponding thiochromanes by oxidation using NaIO 4 or a peroxyacid such as peroxyacetic acid, m-chloroperoxybenzoic acid, and the like, in acidic media.
• optically active isomers of the racemates of the invention are also considered part of this invention.
• Such optically active isomers may be prepared from their respective optically active precursors by the procedures described above, or by resolving the racemic mixtures. This resolution can be carried out in the presence of a resolving agent, by chromatography or by repeated crystallization.
• Particularly useful resolving agents are d- and 1-tartaric acids, d- and 1-ditoluoyltartaric acids, and the like.
• One particularly useful method for producing optically active isomers of the compounds of this invention is via an 8-substituted-2-tetralone, a 5-substituted-3-chromanone, or a 5-substituted-3-thiochromanone.
• Any of these intermediates may be reductively alkylated with an optically active ⁇ -phenethylamine after which the resulting mixture of diastereomers is separated by recognized methodology, such as chromatography. Cleavage of the ⁇ -phenethyl moiety produces a correspondingly substituted, optically active 2-amino-1,2,3,4-tetrahydronaphthalene, 3-aminochromane, or 3-aminothiochromane.
• Cleavage of the p-nitro- ⁇ -phenethyl moiety is achieved by reduction of the p-nitro group followed by acid-catalyzed solvolysis of the resulting p-amino- ⁇ -phenethyl moiety.
• Reduction of the nitro group can be accomplished by a wide range of reducing agents including, for example, titanium trichloride, lithium aluminum hydride, or zinc/acetic acid, or by catalytic hydrogenation.
• Solvolytic cleavage takes place when the monohydrochloride (or other monobasic salt) of the reduction product is treated with water or an alcohol at room temperature or, in some instances, at elevated temperatures.
• a particularly convenient condition for removing the p-nitro- ⁇ -phenethyl moiety is hydrogenation of the amine monohydrochloride in methanol over a platinum catalyst.
• the pharmaceutically acceptable acid addition salts of this invention are typically formed by reacting a 1,2,3,4-tetrahydronaphthalene, chromane, thiochromane sulfoxide, or thiochromane sulfone of this invention with an equimolar or excess amount of acid.
• the reactants are generally combined in a mutual solvent such as diethyl ether or benzene, and the salt normally precipitates out of solution within about one hour to 10 days, and can be isolated by filtration.
• n-Butyllithium (3.5 mmole, 3.0 ml, 1.2M in hexane) was added to a solution of 8-bromo-2-di-n-propylamino-1,2,3,4-tetrahydronaphthalene (1.0 g, 3.2 mmol) in THF (10 ml) at -78° C.
• the reaction was stirred at -78° C. for 45 min and then n-pentanal (0.41 ml, 3.9 mmole) was added.
• the reaction was warmed to room temperature and poured into dilute HCl solution.
• the resulting solution was washed once with ether and the ether layer discarded.
• the aqueous layer was made basic with NH 4 OH solution and extracted with methylenechloride. The extract was dried (Na 2 SO 4 ) and concentrated to give 0.95 g of the crude product.
• 2-Di-n-propylamino-8-bromo-1,2,3,4-tetrahydronaphthalene (5.0 g.; 16.1 mmole) was dissolved in 50 ml of THF, and the mixture was cooled to -78° C. after which 21.0 ml of n-butyllithium (0.92M in hexane) were added. The mixture was stirred for 30 minutes, and 1.85 ml (21.0 mmole) of butyraldehyde were added. The mixture was allowed to warm to room temperature and was stirred overnight after which it was poured into water and extracted with methylene chloride. The extract was dried over sodium sulfate and evaporated to give 6.4 g of a residue.
• the oil was placed on a silica gel column and was eluted with a mixture of 3% methanol and methylene chloride containing a trace of ammonium hydroxide. The appropriate fractions were combined to obtain an oil which, when dissolved in ether, caused a brown precipitate to form. The precipitate was removed by filtration, and the filtrate was evaporated to give 3.0 g. of a light brown oil as the free base of the title compound.
• the compound was converted to its hydrobromide salt and was recrystallized from ethyl acetate to give 80 mg of the title compound as tan crystals, m.p. 175°-176.5° C.
• 2-Di-n-propylamino-8-bromo-1,2,3,4-tetrahydronaphthalene (1.0 g; 3.2 mmole) was dissolved in 10 ml of THF and cooled to -78° C. after which 3.5 ml of n-butyllithium (1.0M in hexane) were added. After 30 minutes, 0.53 ml (3.5 mmole) of ethyl isovalerate was added, and the mixture was warmed to -10° C. and maintained for 30 minutes. The mixture then was poured into dilute acid, washed with ether, and the pH adjusted to 10. The mixture was extracted with methylene chloride, and the extract was dried over sodium sulfate and evaporated to give 0.83 g of a residue.
• the free base was converted to the hydrobromide salt which was recrystallized from a mixture of ethyl acetate and hexane to give 30 mg of the title compound as a tan powder, m.p. 131°-132° C.
• 2-Di-n-propylamino-8-bromo-1,2,3,4-tetrahydronaphthalene (1.0 g; 3.2 mmole) was dissolved in 20 ml of THF and cooled to -78° C. after which 4.7 ml of n-butyllithium (0.82M in hexane) was added. The mixture was stirred for 30 minutes at -78° C. after which 0.56 ml (4.2 mmole) of methyl trimethyl acetate was added. The mixture was allowed to warm to room temperature and then was poured into water and extracted with methylene chloride. The extract was dried over sodium sulfate and evaporated to give 1.6 g of a residue.
• the free base was converted to the hydrobromide salt and was recrystallized from methanol/ethyl acetate to give 80 mg of the title compound, m.p. 157°-158° C.
• 2-Di-n-propylamino-8-bromo-1,2,3,4-tetrahydronaphthalene (1.0 g; 3.2 mmole) was dissolved in 10 ml of THF and cooled to -78° C. after which 2.8 ml of n-butyllithium (1.27M in hexane) were added. The mixture was stirred at -78° C. for 45 minutes after which 0.59 ml (3.5 mmole) of ethyl cyclohexanecarboxylate was added.
• the mixture was warmed to room temperature and then was poured into a 10% hydrochloric acid solution, washed with ether, the pH adjusted to 10 with ammonium hydroxide, and extracted with methylene chloride. The extract was dried over sodium sulfate and evaporated to give 0.8 g of a residue.
• Butyllithium (1.2M in hexane, 3.0 ml, 3.5 mmole) was added to a solution of 8-bromo-2-di-n-propylamino-1,2,3,4-tetrahydronaphthylene (1.0 g, 3.2 mmole) in THF (10 ml) at -78° and stirred for 45 minutes. Cyclohexanecarboxaldehyde (0.47 ml, 3.9 mmole) was added. The reaction was stirred at -78° for five minutes, warmed to room temperature, poured into dilute HCl solution and washed with ether. The aqueous layer was made basic with NH 4 OH and extracted with methylene chloride.
• the extract was dried (Na 2 SO 4 ) and concentrated to give 1.1 g of the crude product.
• the crude product was dissolved in methylene chloride (50 ml) and molecular sieves and pyridinium chlorochromate (1.4 g, 6.4 mmole) added. The reaction was stirred at room temperature for two hours. Methanol (50 ml) was added and the reaction concentrated to provide a slurry. The slurry was dissolved in methylene chloride (50 ml) and enough ether was added to give a cloudy solution. This material was added to a pad of silica gel and eluted with ether.
• the silica gel pad was eluted with 10% methanol in methylene chloride and the eluent concentrated to give an oily residue. This material was triturated with methanol and filtered through Celite. This filtrate was combined with the ether solution from above and concentrated. This material was dissolved in methylene chloride. Ether was added until the solution became cloudy and then filtered through florisil. The filtrate was concentrated to give 560 mg of an oil which was purified by silica gel flash chromatography using 3:1 hexane:ether containing a trace of NH 4 OH as solvent. Appropriate fractions were combined and concentrated to give 350 mg of the desired compound. The oxalate salt was formed and crystallized from ethyl acetate/hexane to give 370 mg of a white solid. m.p. 98.5°-100°.
• the free base was converted to the tosylate salt which was recrystallized from a mixture of acetone and ether to give 125 mg of the title compound as a white powder, m.p. 148.5°-149° C.
• 2-Di-n-propylamino-8-bromo-1,2,3,4-tetrahydronaphthalene (1.0 g; 3.2 mmole) was dissolved in 10 ml of THF and cooled to -78° C. after which 3.5 ml of n-butyllithium (1.0M in hexane) were added. The mixture was stirred for one hour at -78° C. after which 680 mg (1.5 equivalents) of 4-chlorobenzaldehyde in THF were added. The mixture was stirred for 15 minutes at -78° C. and then was allowed to warm to room temperature.
• the mixture was poured into a 10% aqueous hydrochloric acid solution, washed with ether, the pH adjusted to 10 with ammonium hydroxide, and extracted with methylene chloride. The extract was dried over sodium sulfate and evaporated to give 1.5 g of a residue.
• the aqueous layer was made basic with NaOH and extracted with methylene chloride.
• the basic extract was dried (Na 2 SO 4 ) and concentrated to give 200 mg of residue which by nmr did not contain product.
• the extract from the acidic material was dried (Na 2 SO 4 ) and concentrated to give 2.0 g of a residue.
• Purification of this material by flash silica gel chromatography using 1:1 ether:hexane containing a trace of ammonium hydroxide as solvent provided the free base of the title compound (340 mg).
• the salt of 130 mg of this material with p-toluene sulfonic acid was prepared and crystallized from ethyl acetate/ether to provide 118 mg of the title compound. m.p. 107°-109° C.
• the oxalic acid salt was formed and three times recrystallized from ethyl acetate to give the salt as a white powder, m.p. 118° C.
• Butyllithium (1.2M in hexane; 2.8 ml; 3.4 mmol) was added to a solution of 8-bromo-2-di-n-propylamino-1,2,3,4-tetrahydronaphthalene (1 g; 3.22 mmol) in THF (50 ml) at -78° C. After 1.5 hr., a solution of trimethyltin chloride (1.3 g, 2.0 mmol) in THF (20 ml) was added. The reaction mixture was allowed to warm to room temperature, stirred overnight at room temperature, poured into water, and extracted with methylene chloride. The extract was dried (Na 2 SO 4 ) and concentrated to give the crude product. Purification by chromatography using 1:10 methanol:methylene chloride gave 1.2 g of the desired product which was used directly in the next step.
• Bis-triphenylphosphine palladium dichloride 120 mg was added to a solution of 2-dipropylamino-8-trimethylstannyl-1,2,3,4-tetrahydronaphthalene (500 mg, 1.27 mmol) in benzene (20 ml). Methoxyacetyl chloride (1.5 ml; 1.77 g; 16.5 mmol) was added. The reaction mixture was stirred at room temperature overnight and then heated to reflux for 5 hr. The reaction mixture was poured into water and extracted with methylene chloride. The extract was dried (MgSO 4 ) and concentrated to give 800 mg of crude product. Purification by chromatography using 1:10 methanol: methylene chloride as solvent gave 380 mg of 2-di-n-propylamino-8-methoxyacetyl-1,2,3,4-tetrahydronaphthalene.
• n-butyllithium (1.6M in hexane, 15.1 ml, 24.2 mmole) was added to a solution of 8-bromo-2-di-n-propylamino-1,2,3,4-tetrahydronaphthalene (5.0 g, 16.1 mmole) in THF (50 ml) at -78° and the reaction stirred at -78° for one hour. Gaseous carbon dioxide was bubbled through the reaction at -78° until the deep violet color which forms dissipates. Methyllithium (1.4M in ether, 23 ml) was added. The reaction was stirred at -78° for 30 minutes and warmed to room temperature.
• the reaction was stirred for an additional ten minutes at room temperature at which time the pink color had been lost. An additional 10 ml of the methyllithium solution was added and the reaction became pink once again. After 15 minutes, the pink color was lost and an additional 10 ml of the methyllithium solution added.
• the reaction was poured onto ice, made acidic with hydrochloric acid and extracted with ether. The aqueous layer was made basic and extracted with methylenechloride. The basic extracts were dried (Na 2 SO 4 ) and concentrated to give 3.8 g of crude product. Purification by flash silica gel chromatography using 2:1 hexane:ether containing trace ammonium hydroxide provided the free base of the title compound as a yellow oil (2.7 g, 61%).
• the maleate salt was prepared and crystallized from methanol/ethyl acetate/hexane to give the maleate salt. m.p. 115°-116°.
• the hydrochloride salt can be prepared. Crystallization from ethanol/ether provided the hydrochloride salt as colorless crystals. m.p. 124°-125° C.
• n-Butyllithium (1.6 M in hexane, 60.5 ml, 96.8 mmole) was added to a solution of 8-bromo-2-di-n-propylamino-1,2,3,4-tetrahydronaphthalene (20.0 g, 64.5 mmole) in THF (200 ml) at -78° and the reaction stirred at -78° for one hour.
• Acetaldehyde (4.3 ml, 77.4 mmole) was added and the reaction allowed to warm to room temperature.
• the reaction was poured into water, made basic with ammonium hydroxide and extracted with methylene chloride. The extract was dried (Na 2 SO 4 ) and concentrated to give 21.4 g of a yellow oil.
• another embodiment of the present invention is a method of effecting agonist action at the 5-HT 1A receptors which comprises administering to a mammal in need thereof a pharmaceutically effective amount of a compound of the invention.
• pharmaceutically effective amount represents an amount of a compound of the invention which is capable of binding to serotonin 1A receptors.
• the specific dose of compound administered according to this invention will, of course, be determined by the particular circumstances surrounding the case, including, for example, the compound administered, the route of administration, and the condition being treated.
• a typical daily dose generally will contain from about 0.01 mg/kg to about 20 mg/kg of the active compound of this invention.
• Preferred daily doses generally will be from about 0.05 to about 10 mg/kg, and ideally from about 0.1 to about 5 mg/kg.
• the compounds can be administered by a variety of routes including oral, rectal, transdermal, subcutaneous, intravenous, intramuscular, and intranasal.
• routes including oral, rectal, transdermal, subcutaneous, intravenous, intramuscular, and intranasal.
• a special feature of the compounds of this invention is that they are extremely selective in effecting agonist action at serotonin 1A receptors relative to other serotonin receptors.
• the compounds of this invention are believed to have the ability to treat in mammals a variety of 5-HT mediated states and disorders such as sexual disorders, eating disorders, depression, alcoholism, pain, senile dementia, anxiety, and smoking. Therefore, the present invention also provides methods of treating the above disorders at rates set forth above for agonist action in mammals at 5-HT receptors.
• mice Male Sprague-Dawley rats (110-150 g) from Harlan Industries (Cumberland, Ind.) were fed a Purina Chow ad libitum for at least 3 days before being used in the studies. Rats were killed by decapitation. The brains were rapidly removed, and the cerebral cortices were dissected out at 4° C.
• Binding of ( 3 H-8-OH-DPAT) was performed according to the previously described method [Wong et al., J. Neural Transm. 64:251-269 (1985)]. Briefly, synaptosomal membranes isolated from cerebral cortex were incubated at 37° C. for 10 min. in 2 ml of 50 mM Tris-HCl, pH 7.4; 10 ⁇ M pargyline; 0.6 mM ascorbic acid; 0.4 nM 3 H-8-OH-DPAT; and from 1 to 1000 nM of test compound. Binding was terminated by filtering samples under reduced pressure through glass fiber (GFB) filters.
• GFB glass fiber
• the filters were washed twice with 5 ml of ice cold buffer and placed in scintillation vials with 10 ml of PCS (Amersham/Searle) scintillation fluid. Radioactivity was measured with a liquid scintillation spectrometer. Unlabeled 8-OH-DPAT at 10 ⁇ M was also included in separate samples to establish non-specific binding. Specific binding of 3 H-8-OH-DPAT is defined as the difference of radioactivity bound in the absence and in the presence of 10 ⁇ M unlabeled 8-OH-DPAT.
• Table I The results of the evaluation of various compounds of the present invention are set forth below in Table I.
• the first column provides the Example Number of the compound evaluated; the next 7 columns identify the structure of the compound evaluated when taken with the formula set forth in the heading; the next-succeeding column identifies the salt form of the compound evaluated; and the final column provides the amount of the test compound expressed in nanomolar concentration required to inhibit the binding of 3 H-8-OH-DPAT) by 50%, and is indicated in Table I as IC 50 .
• Another embodiment of the present invention is a pharmaceutical formulation comprising a compound of the invention and a pharmaceutically acceptable carrier, diluent or excipient therefor.
• the active ingredient will usually be mixed with a carrier, or diluted by a carrier, or enclosed within a carrier which may be in the form of a capsule, sachet, paper or other container.
• a carrier which may be in the form of a capsule, sachet, paper or other container.
• the carrier serves as a diluent, it may be a solid, semisolid or liquid material which acts as a vehicle, excipient or medium for the active ingredient.
• compositions can be in the form of tablets, pills, powders, lozenges, sachets, cachets, elixirs, suspensions, emulsions, solutions, syrups, aerosols (as a solid or in a liquid medium), ointments containing, for example, up to 10% by weight of the active compound, soft and hard gelatin capsules, suppositories, sterile injectable solutions, sterile packaged powders, and the like.
• Suitable carriers, excipients, and diluents are lactose, dextrose, sucrose, sorbitol, mannitol, starches, gum acacia, calcium phosphate, alginates, tragacanth, gelatin, calcium silicate, microcrystalline cellulose, polyvinylpyrrolidone, cellulose, water syrup, methyl cellulose, methyl-hydroxybenzoates, propyl hydroxybenzoates, talc, magnesium stearate, and mineral oil.
• the formulations may additionally include lubricating agents, wetting agents, emulsifying agents, suspending agents, preserving agents, sweetening agents, flavoring agents, and the like.
• the compositions of the invention may be formulated so as to provide quick, sustained or delayed release of the active ingredient after administration to the patient by employing procedures well known in the art.
• compositions are preferably formulated in a unit dosage form, each dosage generally containing from about 0.1 to about 500 mg, and preferably from about 1 to about 250 mg, of the active ingredient.
• unit dosage form refers to physically discrete units suitable as unitary dosages for human subjects and other mammals, each unit containing a predetermined quantity of active material calculated to produce the desired therapeutic effect, in association with a suitable pharmaceutical carrier.
• Hard gelatin capsules are prepared using the following ingredients:
• the above ingredients are mixed and filled into hard gelatin capsules in 460 mg quantities.
• a tablet is prepared using the ingredients below:
• the components are blended and compressed to form tablets each weighing 665 mg.
• An aerosol solution is prepared containing the following components:
• the active compound is mixed with ethanol and the mixture added to a portion of the propellant 22, cooled to -30° C. and transferred to a filling device. The required amount is then fed to a stainless steel container and diluted with the remainder of the propellant. The valve units are then fitted to the container.
• Tablets each containing 60 mg of active ingredient, are made as follows:
• the active ingredient, starch and cellulose are passed through a No. 45 mesh U.S. sieve and mixed thoroughly.
• the aqueous solution containing polyvinylpyrrolidone is mixed with the resultant powder, and the mixture then is passed through a No. 14 mesh U.S. sieve.
• the granules so produced are dried at 50° C. and passed through a No. 18 mesh U.S. sieve.
• the sodium carboxymethyl starch, magnesium stearate and talc, previously passed through a No. 60 mesh U.S. sieve, are then added to the granules which, after mixing, are compressed on a tablet machine to yield tablets each weighing 150 mg.
• Capsules each containing 80 mg of active ingredient, are made as follows:
• the active ingredient, cellulose, starch, and magnesium stearate are blended, passed through a No. 45 mesh U.S. sieve, and filled into hard gelatin capsules in 200 mg quantities.
• Suppositories each containing 225 mg of active ingredient, are made as follows:
• the active ingredient is passed through a No. 60 mesh U.S. sieve and suspended in the saturated fatty acid glycerides previously melted using the minimum heat necessary. The mixture is then poured into a suppository mold of nominal 2 g capacity and allowed to cool.
• Suspensions each containing 50 mg of active ingredient per 5 ml dose, are made as follows:
• the active ingredient is passed through a No. 45 mesh U.S. sieve and mixed with the sodium carboxymethyl cellulose and syrup to form a smooth paste.
• the benzoic acid solution, flavor and color are diluted with a portion of the water and added, with stirring. Sufficient water is then added to produce the required volume.
• An intravenous formulation may be prepared as follows:
• the solution of the above ingredients generally is administered intravenously at a rate of 1 ml per minute to a subject suffering from depression.

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• 1991
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